revised how to get access to git diff

ChangeLog

@@ -812,7 +812,9 @@ bind10-devel-20100319 released on March 19, 2010
 
 For complete code revision history, see http://bind10.isc.org/browser
 Specific git changesets can be accessed at:
-	http://bind10.isc.org/changeset/rrrr
+	http://bind10.isc.org/changeset/?reponame=&old=rrrr^&new=rrrr
+or after cloning the original git repository by executing:
+	% git diff rrrr^ rrrr
 Subversion changesets are not accessible any more.  The subversion
 revision numbers will be replaced with corresponding git revisions.
 Trac tickets can be accessed at: https://bind10.isc.org/ticket/nnn